Datasheet

78K0/Kx2-L CHAPTER 24 OPTION BYTE

R01UH0028EJ0400 Rev.4.00 698

Sep 27, 2010

Here is an example of description of the software for setting the option bytes.

OPT CSEG AT 0080H

OPTION: DB 30H ; Enables watchdog timer operation (illegal access detection operation),

; Window open period of watchdog timer: 50%,

; Overflow time of watchdog timer: 2

/fIL,

; Internal low-speed oscillator can be stopped by software.

DB 00H ; LVI default start function stopped

DB 00H ; Internal high-speed oscillation clock frequency 8 MHz (TYP.)

DB 1EH ; Use the TOOLC0/X1, TOOLD0/X2 pins

DB 02H ; Operation enabled. Does not erase data of the flash memory in case

; authentication of the on-chip debug security ID fails.

Remark Referencing of the option byte is performed during reset processing. For the reset processing timing, refer to

CHAPTER 20 RESET FUNCTION.

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